From 9f9988bfeb66a36362b72ba46a48daac76758fa9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simen=20Kj=C3=A6r=C3=A5s?= <simen.kjaras@gmail.com>
Date: Mon, 3 Dec 2018 10:49:46 +0100
Subject: [PATCH] Fix issue 19456 - ParameterIdentifierTuple incorrect for
 abstract methods with unnamed parameters

---
 std/traits.d | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/std/traits.d b/std/traits.d
index 47ecc8e8965..f0938aea36c 100644
--- a/std/traits.d
+++ b/std/traits.d
@@ -1381,7 +1381,9 @@ if (func.length == 1 && isCallable!func)
         {
             static if (!isFunctionPointer!func && !isDelegate!func
                        // Unnamed parameters yield CT error.
-                       && is(typeof(__traits(identifier, PT[i .. i+1]))))
+                       && is(typeof(__traits(identifier, PT[i .. i+1])))
+                       // Filter out unnamed args, which look like (Type) instead of (Type name).
+                       && PT[i].stringof != PT[i .. i+1].stringof[1..$-1])
             {
                 enum Get = __traits(identifier, PT[i .. i+1]);
             }
@@ -1418,6 +1420,16 @@ if (func.length == 1 && isCallable!func)
     static assert([ParameterIdentifierTuple!foo] == ["num", "name", ""]);
 }
 
+// Issue 19456
+@safe unittest
+{
+    struct SomeType {}
+    void foo(SomeType);
+    void bar(int);
+    static assert([ParameterIdentifierTuple!foo] == [""]);
+    static assert([ParameterIdentifierTuple!bar] == [""]);
+}
+
 @safe unittest
 {
     alias PIT = ParameterIdentifierTuple;